45 How does a White Dwarf produce Energy (Trick question!) There is no more fuel! all the Hydrogen has been used. Now it s just cooling off (but it s really hot!)

46 How do you form a star?

47 How do you form a star? step 1: Start with a Giant molecular cloud

48 How do you form a star? step 1: Start with a Giant molecular cloud step 2: The cloud starts free-fall contraction

49 How do you form a star? step 1: Start with a Giant molecular cloud step 2: The cloud starts free-fall contraction step 3:contraction is slowed by increasing Temp and density. 1/2 the gravitational energy is used to heat up, the other 1/2 is radiated.

50 How do you form a star? step 1: Start with a Giant molecular cloud step 2: The cloud starts free-fall contraction step 3:contraction is slowed by increasing Temp and density. 1/2 the gravitational energy is used to heat up, the other 1/2 is radiated. step 4: The core becomes hot enough to begin fusing Hydrogen!

51 How do you form a star? step 1: Start with a Giant molecular cloud step 2: The cloud starts free-fall contraction step 3:contraction is slowed by increasing Temp and density. 1/2 the gravitational energy is used to heat up, the other 1/2 is radiated. step 4: The core becomes hot enough to begin fusing Hydrogen! Yay a star is born!

52 The luminosity of a typical super nova, during the explosion, will increase by a factor of A. a few B. a million C. a thousand D. a hundred billion

53 The Sun will not end it's life as a A. white dwarf B. planetary nebula C. pulsar D. red giant

56 Which is the correct Theory on moon formation? 1. The moon was captured by the Earth 2. The moon formed next to Earth 3. The moon was formed from a collision between Earth and a Mars sized object 4. The early Earth spun so fast if flung the moon out

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